Hi Charles,
Thank you for writing to us today. Could you please confirm if you are using Google Ads API or Scripts to set up ad customizers? If you are using Google Ads Scripts and looking for a way to insert conditionals via scripts, I would recommend posting on Google Ads Scripts Forum as they would be able to assist you better with your concern. Feel free to reach out if you have any concerns related to Google Ads API/Adwords API.
Regards,
Nikisha Patel, Google Ads API Team